The group’s spokesman, Sarbaz Baluch, said in a phone call from an undisclosed location that the attack was a reaction to what he alleged were killings in Baluchistan’s Dera Bugti region by Pakistani paramilitaries.

The group also blew up three gas pipelines last week, suspending supplies to millions of households for two days.

Local Pakistani TV channels showed footage of several badly damaged train cars lying off the track.

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Pakistan’s railways minister, Saad Rafiq, said officials were working to reopen the track.

Meanwhile, a roadside bomb killed a police officer guarding a polio vaccination drive team in the outskirts of northwestern city of Peshawar.

Police official Ibrahim Khan said another officer was wounded in the attack during the weekly antipolio campaign in the Budhni area.